State-1 State-2 Transition Influenced by Herbicides Which Modify Fatty Acid Composition in Leaves

Graf, Josef A.; Strasser, Reto J.; Kull, Ulrich

doi:10.1007/978-94-017-4971-8_10

Cited by 3 publications

(1 citation statement)

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“…But the absence of any increase in the room temperature fluorescence yield under these conditions can be taken as an evidence for a significant alteration in the lipid matrix of thylakoids treated with BASF 13.338. It is interesting to note that Graf et aL (6) did not observe any difference in electron transport rates (PSII or …”

Section: Discussionmentioning

confidence: 77%

Changes in the Cationic Regulation of Structure and Function in Thylakoids Isolated from Wheat Seedlings Treated with BASF 13.338

Mannan¹,

Bose²

1987

Plant Physiol.

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ABSTRACTcompound interferes with the biosynthesis of linolenic acid (9,11,15) leading to an increase in the ratio of linoleic acid to linolenic acid and one would predict, a more rigid and viscous membrane.Cation-mediated regulation of chloroplast structure and function is dependent upon the fluidity of the thylakoid membrane (3). Barber et al. (4) suggested that the cation-induced increase in Chl a fluorescence can be used as an intrinsic probe for monitoring changes in the fluidity of the thylakoid membranes. Direct experimental evidence in support of this suggestion is derived from the correlation between cation-induced fluorescence changes and polarization of diphenyl hexatriene fluorescence in aging chloroplasts (4) as well as in thylakoid membranes infused with cholesteryl hemisuccinate (4, 18).The cation-induced increased in Chl a fluorescence is used here to monitor changes in the fluidity of the thylakoid membranes brought about through manipulation of fatty acid composition by growth in the presence of BASF 13.338. The presumption on which the present study is based is that if the changes in the fatty acid composition brought about by BASF 13.338 treatment are large enough to decrease the fluidity parameter of the thylakoid membranes, then a partial loss in the cationic regulation of chloroplast structure and function should result.Linolenic acid, a polyunsaturated fatty acid, accounts for about 60 to 70% of the total fatty acid content of the thylakoids membrane lipids (1) and consequently a relatively high fluidity may be expected for thylakoid membranes at physiological temperatures. The functional significance of this fluidity is not yet clear. One approach to this problem is to specifically manipulate the fatty acid composition of thylakoid membranes in vivo and study any effects on structural and functional properties. St. John (17) showed that the fatty acid composition of the major thylakoid lipids, the mono-and digalactosyl diglycerides, can be definably altered with BASF 13.3384/SAN 9785). This ' Dedicated to Prof. S. Krishnaswamy on the occasion of his sixty-first birthday.

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Section: Discussionmentioning

confidence: 77%